Bennett's comments on CNN came after Bolduan asked whether a remark Trump made during his San Jose, California, rally Thursday night was a "real threat." Trump had suggested that his theoretical administration's attorney general would take a "very good look" into Clinton's use of a private email server during her tenure as secretary of state.

Bolduan asked whether Trump should still pursue an investigation by the attorney general if the Department of Justice "finds that there was nothing illegal that happened."

"I'm more interested in the FBI," said Bennett, who once served as ex-presidential hopeful Ben Carson's campaign manager. "But if the DOJ tries to stop the FBI, then yes."

The report cited "longstanding, systemic weaknesses" related to communications that preceded Clinton's appointment as secretary of state. But the inspector general's report singled out Clinton's failures as more serious.

"At a minimum, Secretary Clinton should have surrendered all emails dealing with department business before leaving government service and, because she did not do so, she did not comply with the Department's policies that were implemented in accordance with the Federal Records Act," the report said.